Names starting with 'O'

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Officinal Spurge (Euphorbia resinifera)
Ohio Buckeye (Aesculus glabra)
Okame zasa (Shibataea kumasaca)
Okinawan Holly (Ilex dimorphophylla)
okra (Abelmoschus esculentus)
Olaga (Opuntia borinquensis)
Old Lady Cactus (Mammillaria hahniana)
Old Man Cactus, Old Man of Mexico, Cabeza de Viejo (Cephalocereus senilis)
Old Man of the Andes (Oreocereus celsianus)
Old Man of the Mountain (Oreocereus trollii)
Old Man Saltbush, Giant Saltbush (Atriplex nummularia)
Old Woman, Dusty Miller, Beach Wormwood (Artemisia stelleriana)
Old-fashioned weigela (Weigela florida)
Oleander, Rose Bay (Nerium oleander)
Oleander-Leaved Protea (Protea neriifolia)
Olive (Olea europaea)
Oneseed Hawthorn (Crataegus monogyna)
Opium Poppy (Papaver somniferum)
Orange Ball Tree, Orange Butterfly Bush (Buddleia globosa)
Orange Cestrum (Cestrum aurantiacum)
Orange Clock Vine (Thunbergia gregorii)
Orange Cob Cactus (Echinopsis famatimensis)
Orange Coneflower (Rudbeckia fulgida)
Orange Cotoneaster (Cotoneaster franchetii)
Orange Jessamine (Murraya paniculata)
Orange King (Berberis linearifolia)
Orange Lily, Fire Lily (Lilium bulbiferum)
Orange Mint, Bergamot Mint (Mentha aquatica var. 'Citrata')
Orange River Lily (Crinum bulbispermum)
Orange Trumpet Flower (Tecoma 'Burnt-Out')
Orange Tulip Ginger (Costus curvibracteatus)
Orange Zexmenia, Rough Zexmenia (Zexmenia hispida)
Orchid Rockrose, Rockrose (Cistus purpureus)
Orchid Tree (Bauhinia variegata)
Orchid Tree (Bauhinia monandra)
Orcutt's Liveforever, Tapertip Liveforever (Dudleya attenuata)
Oregano, Wild Marjoram, Greek Oregano (Origanum vulgare)
Oregon Ash (Fraxinus latifolia)
Oregon Boxleaf, Falsebox (Paxistima myrsinites)
Oregon Fleabane (Erigeron speciosus)
Oregon White Oak, Garry Oak, Brewer Oak (Quercus garryana)
Organ Mountain Foxtail Cactus (Escobaria organensis)
Organ Pipe Cactus, Pitahaya Dulce (Stenocereus thurberi)
Organito de Vibora (Peniocereus viperinus)
Organo (Cephalocereus columna-trajani)
Organpipe Cactus (Stenocereus thurberi ssp. littoralis)
Oriental arborvitae (Platycladus orientalis)
Oriental Fountaingrass (Pennisetum orientale)
Oriental Photinia (Photinia villosa)
Oriental Poppy (Papaver orientale)
Oriental Spruce (Picea orientalis)
Oriental Sweet Gum (Liquidambar orientalis)
Ornamental Catmint (Nepeta faassenii)
Ornamental Corn (Zea mays)
Ornamental Onion (Allium aflatunense)
Ornamental Onion, Turkestan Allium (Allium karataviense)
Orphine, Live Forever (Hylotelephium spectabile)
Osage Orange (Maclura pomifera)


Ostrich Fern (Matteuccia struthiopteris)
Oval Leaf Privet, California Privet (Ligustrum ovalifolium)
Ovens Wattle (Acacia pravissima)
Owl's Eyes (Mammillaria parkinsonii)
Ox Eye (Heliopsis helianthoides var. scabra)
Ox Tongue Lily (Haemanthus coccineus)
Ox-eye Daisy, Common Daisy (Leucanthemum vulgare)
Oxlip (Primula elatior)
Oyama Magnolia (Magnolia sieboldii)
Ozark Blue Star Flower (Amsonia illustris)
Ozark Sundrop, Yellow Evening Primrose (Oenothera macrocarpa)
Ozark Witchhazel (Hamamelis vernalis)

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